This name is a synonym of Symphyotrichum laeve (L.) Á.Löve & D.Löve.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 9831D6C3-DA17-48D7-9DFE-DDC76A00E9EF) with original publication details: Muhlenbergia 6 47 1910.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23619-2.
This name was in version 1 of The Plant List, record gcc-68298.